West Sussex Road Policing Unit are currently attending the incident and have warned there may delays for both road and train users.
A spokesperson for National Rail said the delays could last until at least 4.30pm this evening.
In a statement put out by Southern Rail on their website the company said services between Brighton, Arundel, Littlehampton and Barnham may experience short alterations or cancellations.
The statement reads: “Owing to emergency services dealing with an incident at Ford all service between Brighton/Arundel/Littlehampton and Barnham are subject to short notice alterations, cancellations and delays of up to 30 minutes.
“Stagecoach will pass tickets on route 700 between Brighton and Portsmouth.”